// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using Microsoft.CodeAnalysis.AddImport;
using Microsoft.CodeAnalysis.CodeStyle;

namespace Microsoft.CodeAnalysis.CSharp.CodeStyle;

internal static partial class CSharpCodeStyleOptions
{
    public static CodeStyleOption2<ExpressionBodyPreference> ParseExpressionBodyPreference(
        string optionString, CodeStyleOption2<ExpressionBodyPreference> @default)
    {
        // optionString must be similar to true:error or when_on_single_line:suggestion.
        if (CodeStyleHelpers.TryGetCodeStyleValueAndOptionalNotification(optionString,
                @default.Notification, out var value, out var notification))
        {
            if (bool.TryParse(value, out var boolValue))
            {
                return boolValue
                    ? new CodeStyleOption2<ExpressionBodyPreference>(ExpressionBodyPreference.WhenPossible, notification)
                    : new CodeStyleOption2<ExpressionBodyPreference>(ExpressionBodyPreference.Never, notification);
            }

            if (value == "when_on_single_line")
            {
                return new CodeStyleOption2<ExpressionBodyPreference>(ExpressionBodyPreference.WhenOnSingleLine, notification);
            }
        }

        return @default;
    }

    private static string GetExpressionBodyPreferenceEditorConfigString(CodeStyleOption2<ExpressionBodyPreference> value, CodeStyleOption2<ExpressionBodyPreference> defaultValue)
    {
        var notificationString = CodeStyleHelpers.GetEditorConfigStringNotificationPart(value, defaultValue);
        return value.Value switch
        {
            ExpressionBodyPreference.Never => $"false{notificationString}",
            ExpressionBodyPreference.WhenPossible => $"true{notificationString}",
            ExpressionBodyPreference.WhenOnSingleLine => $"when_on_single_line{notificationString}",
            _ => throw new NotSupportedException(),
        };
    }

    public static CodeStyleOption2<AddImportPlacement> ParseUsingDirectivesPlacement(
        string optionString, CodeStyleOption2<AddImportPlacement> @default)
    {
        if (CodeStyleHelpers.TryGetCodeStyleValueAndOptionalNotification(
                optionString, @default.Notification, out var value, out var notification))
        {
            return value switch
            {
                "inside_namespace" => new CodeStyleOption2<AddImportPlacement>(AddImportPlacement.InsideNamespace, notification),
                "outside_namespace" => new CodeStyleOption2<AddImportPlacement>(AddImportPlacement.OutsideNamespace, notification),
                "outside_namespace_ignoring_aliases" => new CodeStyleOption2<AddImportPlacement>(AddImportPlacement.OutsideNamespaceIgnoringAliases, notification),
                _ => throw new NotSupportedException(),
            };
        }

        return @default;
    }

    public static string GetUsingDirectivesPlacementEditorConfigString(CodeStyleOption2<AddImportPlacement> value, CodeStyleOption2<AddImportPlacement> defaultValue)
    {
        var notificationString = CodeStyleHelpers.GetEditorConfigStringNotificationPart(value, defaultValue);
        return value.Value switch
        {
            AddImportPlacement.InsideNamespace => $"inside_namespace{notificationString}",
            AddImportPlacement.OutsideNamespace => $"outside_namespace{notificationString}",
            AddImportPlacement.OutsideNamespaceIgnoringAliases => $"outside_namespace_ignoring_aliases{notificationString}",
            _ => throw new NotSupportedException(),
        };
    }

    public static CodeStyleOption2<NamespaceDeclarationPreference> ParseNamespaceDeclaration(
        string optionString, CodeStyleOption2<NamespaceDeclarationPreference> @default)
    {
        if (CodeStyleHelpers.TryGetCodeStyleValueAndOptionalNotification(
                optionString, @default.Notification, out var value, out var notification))
        {
            return value switch
            {
                "block_scoped" => new(NamespaceDeclarationPreference.BlockScoped, notification),
                "file_scoped" => new(NamespaceDeclarationPreference.FileScoped, notification),
                _ => throw new NotSupportedException(string.Format(CSharpCompilerExtensionsResources.EditorConfig_option_0_contains_unrecognized_value_1, "csharp_style_namespace_declarations", value)),
            };
        }

        return @default;
    }

    public static string GetNamespaceDeclarationEditorConfigString(CodeStyleOption2<NamespaceDeclarationPreference> value, CodeStyleOption2<NamespaceDeclarationPreference> defaultValue)
    {
        var notificationString = CodeStyleHelpers.GetEditorConfigStringNotificationPart(value, defaultValue);
        return value.Value switch
        {
            NamespaceDeclarationPreference.BlockScoped => $"block_scoped{notificationString}",
            NamespaceDeclarationPreference.FileScoped => $"file_scoped{notificationString}",
            _ => throw new NotSupportedException(),
        };
    }

    private static CodeStyleOption2<PreferBracesPreference> ParsePreferBracesPreference(
        string optionString,
        CodeStyleOption2<PreferBracesPreference> defaultValue)
    {
        if (CodeStyleHelpers.TryGetCodeStyleValueAndOptionalNotification(
            optionString,
            defaultValue.Notification,
            out var value,
            out var notificationOption))
        {
            if (bool.TryParse(value, out var boolValue))
            {
                return boolValue
                    ? new CodeStyleOption2<PreferBracesPreference>(PreferBracesPreference.Always, notificationOption)
                    : new CodeStyleOption2<PreferBracesPreference>(PreferBracesPreference.None, notificationOption);
            }

            if (value == "when_multiline")
            {
                return new CodeStyleOption2<PreferBracesPreference>(PreferBracesPreference.WhenMultiline, notificationOption);
            }
        }

        return defaultValue;
    }

    private static string GetPreferBracesPreferenceEditorConfigString(CodeStyleOption2<PreferBracesPreference> value, CodeStyleOption2<PreferBracesPreference> defaultValue)
    {
        var notificationString = CodeStyleHelpers.GetEditorConfigStringNotificationPart(value, defaultValue);
        return value.Value switch
        {
            PreferBracesPreference.None => $"false{notificationString}",
            PreferBracesPreference.WhenMultiline => $"when_multiline{notificationString}",
            PreferBracesPreference.Always => $"true{notificationString}",
            _ => throw ExceptionUtilities.Unreachable(),
        };
    }
}